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This method returns the length of lines or the perimeter of polygons.
When the crs is not longitude/latitude, you may get more accurate results by first unprojecting the SpatVector (you can use project to transform the crs to longitude/latitude)
project
# S4 method for SpatVector perim(x)
numeric (m)
SpatVector
f <- system.file("ex/lux.shp", package="terra") v <- vect(f) perim(v)
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